Alert archive / Texas / Special Weather Statements in 2021

Special Weather Statement, NWS Austin/San Antonio, TX

August 2, 2021Bexar County, Comal County, Texas

NWS Austin/San Antonio, TX issued this special weather statement at Aug 2, 2021, 8:18 AM CDT for Bexar County, Comal County, Texas. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 2, 2021, 8:18 AM CDT (13:18 UTC)
Expired
Aug 2, 2021, 9:00 AM CDT
In force
42 min
Issued by
NWS Austin/San Antonio, TX

Counties Bexar County, TX, Comal County, TX

The radar

The Austin/San Antonio radar (KEWX), 52 km from the middle of the area, began a volume at 13:19 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 1.3 hours before the alert went out and 225 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Del Rio, TX at 12:00Z on 2021-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 241 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 12:00Z on 2021-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
241 J/kg
Mixed-layer CIN
-123 J/kg
Mixed-layer LCL
905 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

519 
WWUS84 KEWX 021318
SPSEWX

Special Weather Statement
National Weather Service Austin/San Antonio TX
818 AM CDT Mon Aug 2 2021
 
TXZ189-204>206-220-021400-
Comal TX-Atascosa TX-Bexar TX-Medina TX-Kendall TX-
818 AM CDT Mon Aug 2 2021

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL MEDINA...
NORTHWESTERN ATASCOSA...SOUTHEASTERN KENDALL...BEXAR AND CENTRAL
COMAL COUNTIES UNTIL 900 AM CDT...

At 818 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Guadalupe River State Park to 6 miles
southwest of Lackland AFB. Movement was east at 15 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
San Antonio, Schertz, Universal City, Live Oak, Boerne, Selma,
Stinson Municipal Airport, San Antonio Int Airport, Randolph AFB,
Canyon Lake, Leon Valley, Helotes, Fair Oaks Ranch, Kirby, Alamo
Heights, Windcrest, Terrell Hills, Bulverde, Garden Ridge and Shavano
Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2924 9884 2970 9880 2972 9878 2973 9880
      2990 9878 2991 9820 2962 9825 2959 9831
      2956 9830 2955 9827 2919 9834 2912 9840
      2910 9840
TIME...MOT...LOC 1318Z 269DEG 13KT 2985 9853 2932 9869 

$$

BRADY

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 1, 7:53 PM CDTAreal Flood AdvisoryEWXBandera, Real3 hr
Aug 1, 11:02 PM CDTAreal Flood AdvisoryEWXKendall3 hr
Aug 2, 12:27 AM CDTAreal Flood AdvisoryEWXBastrop, Hays, Travis3 hr
Aug 2, 3:45 AM CDTAreal Flood AdvisoryEWXComal, Guadalupe, Hays4 hr
Aug 2, 3:53 AM CDTAreal Flood AdvisoryEWXEdwards, Kinney4 hr
Aug 2, 4:09 AM CDTFlash Flood Warning Considerable damage threatEWXComal, Guadalupe4 hr
Aug 2, 4:13 AM CDTAreal Flood AdvisoryEWXUvalde4 hr
Aug 2, 5:41 AM CDTFlash Flood Warning Considerable damage threatEWXGuadalupe4 hr
Aug 2, 5:45 AM CDTAreal Flood AdvisoryEWXBexar, Guadalupe, Wilson3 hr
Aug 2, 5:51 AM CDTAreal Flood AdvisoryEWXBandera, Real3 hr
Aug 2, 5:57 AM CDTAreal Flood AdvisoryEWXComal, Hays4 hr
Aug 2, 6:37 AM CDTAreal Flood AdvisoryEWXBandera, Kerr, Medina4 hr
Aug 2, 6:37 AM CDTFlash Flood Warning Considerable damage threatEWXComal5 hr
Aug 2, 6:52 AM CDTFlash Flood Warning Considerable damage threatEWXHays3 hr
Aug 2, 7:15 AM CDTAreal Flood AdvisoryEWXBandera, Bexar, Comal, Kendall, Kerr, Medina5 hr
Aug 2, 7:29 AM CDTSpecial Weather StatementEWXBexar46 min
Aug 2, 7:47 AM CDTFlash Flood Warning Considerable damage threatEWXBexar, Comal, Kendall4 hr
Aug 2, 8:13 AM CDTAreal Flood AdvisoryEWXKinney3 hr
Aug 2, 8:15 AM CDTAreal Flood AdvisoryEWXBastrop, Lee, Travis, Williamson5 hr
Aug 2, 8:26 AM CDTAreal Flood AdvisoryEWXBexar, Comal, Kendall4 hr
Aug 2, 8:36 AM CDTAreal Flood AdvisoryEWXBexar4 hr
Aug 2, 9:16 AM CDTAreal Flood AdvisoryEWXBlanco, Hays, Travis3 hr
Aug 2, 10:25 AM CDTAreal Flood AdvisoryEWXKinney, Maverick, Uvalde, Zavala3 hr
Aug 2, 2:45 PM CDTAreal Flood AdvisoryEWXBandera, Edwards, Kerr, Real, Val Verde3 hr
Aug 2, 4:56 PM CDTAreal Flood AdvisoryEWXTravis, Williamson3 hr
Aug 2, 5:12 PM CDTAreal Flood AdvisoryEWXBlanco, Hays3 hr
Aug 2, 6:19 PM CDTAreal Flood AdvisoryEWXCaldwell, Hays, Travis2 hr

Nearby

Special Weather Statements in Texas, 2021Every special weather statement in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.